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PPSC Chemistry Full Book Test MCQs With Answers
Question # 1
Pyrolysis gasoline is obtained from.
Choose an answer
Catalytic cracking
Gasification
Steam cracking
Reforming
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Question # 2
The most important problem regarding nano chemistry
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Elucidation of relationship between also and chemical reactivity of particle
Determination of size of particle
Determination of reactivity of particle
Determination of physical properties of nano particles.
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Question # 3
The pKa of acetic acid is 4.74 which implies that.
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pH of 1N solution is 4.74
At pH 4.74 the dissociation of acetic acid is maximum
At pH 4.74 half of the acetic acid molecules are dissociated in the solution.
At pH 4.74 the dissociation of acetic acid is minimum.
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Question # 4
When alkyl iodidies are decomposed by light then the product obtained is.
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R - R
R - H
RCH2I
RCHI2
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Question # 5
Used in Geiger counter to detect radioactivity
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He
Ne
Ar
Kr
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Question # 6
Which of the following factors does not effect the rate of the reaction.
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Pressure
Temperature
Concentration
Catalyst
All of the above
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Question # 7
Which of the following is not related to crystallography .
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Law of rational indices
Law of anymmetry
Law of constancy of interfacial angel
Henry's law
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Question # 8
Pig iron is also called.
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Cast iron
Steel
Wrought iron
Stainless steel
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Question # 9
Which of the following orbitals has maximum penetration effect.
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s
p
d
f
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Question # 10
The phenomenon of x-ray diffraction was studied by
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Huygen
Bragg
Max Planck
None of above
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Question # 11
The most electronegative and the most electromotive elements of the first period is
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H and He
Na and Cl
Li and F
H and He
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Question # 12
Carbon in wrought iron is present as
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Silicon carbide
Iron carbide or comentite
Graphite
Partly as iron carbide and partly as graphite
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Question # 13
Which of the following statement is not related with the effect of thermal pollution.
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Decrease in BOD
Increase in BOD
Reduction in DO
Change in algal production
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Question # 14
What element is added to copper to make it extremely hard.
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Aluminum
Zinc
Lead
Tin
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Question # 15
Which of the following in not a characteristics of crystalline solids.
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Sharp melting point
Isotropic
Long range orderly arrangemnt
None of above
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Question # 16
Most Hazardous metal pollutant of automobile exhaust is.
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Tin
Mercury
Cadmium
Lead
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Question # 17
Which of the following elements of group 15 is a typical metal.
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P
As
Bi
Sb
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Question # 18
According to Arrhenius theory an acid is defined as substance which
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Accepts and electron pair
Donatees H+ ion in ammonia
Contains Cl- ions
Furnishes H3O + ion in water
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Question # 19
Dull red flame is observed with
Choose an answer
Calcium salt
Barium salt
Strontium salt
Sodium salt
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Question # 20
How many sigma and pi bonds are there in a CO2 molecule.
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2 sigma
2 sigma and 4 pi
2 sigma and 2 pi
4 sigma and no pi
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Question # 21
Aromatic amine (X) was treated with alcoholic potash and another compound (Y) when foul smelling gas was formed with formula C2H3N (Y) was formed by reacting a compound (Z) with Cl2 in the presence of slaked lime . The compound (Z) is
Choose an answer
C6H5NC
CHCl3
CH3CH2OH
C6H5NH2
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Question # 22
Which of the following elements with excess oxygen to form proxides.
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Ca
Mg
Li
Ba
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Question # 23
The use of acids to remove oxides and acids on hot worked steels is known as
Choose an answer
Tempering
Picking
Machining
Sizing
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Question # 24
Which is incorrect statement for Xe F2.
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It has linear structure.
It is hydrolyzed rapidly in aqueous solution of a base
It oxidizes Cl and I to Cl2 and I 2 respectively
It cannot act as F donor
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Question # 25
Which of the following reagent cannot be used to detect the phenolic group.
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Neutral FeCl3
I2/NaOH
NaOH solution
Br2/H2O
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Question # 26
The ions Sc3+ , Ca2+ and K+ have same electronic configuration as that of.
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Neon
Argon
Krypton
Xenon
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Question # 27
Which of the following statements is not correct with respect to limitations of flame photometry.
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Low energy of the exciting source
Liquid samples are generally used
Can be employed for direct detection halides or inert gases
It does not provide informatin about the molecular forms of metals.
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Question # 28
The pH of the 0.0032 M H2SO4 is.
Choose an answer
3.2
4.0
2.198
1.0
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Question # 29
Yellow green flame is observed with
Choose an answer
Calcium salt
Barium salt
Strontium salt
Sodium salt
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Question # 30
Which of the following statement is not related to collision theory.
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Molecules must collide with each other to do a chemical reaction
Molecules must posses a minimum amount of energy
Molecules must have proper orientation
Collision theory is applicable to liquid only.
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Question # 31
The inert gases Ar, Kr and Ke form compounds with water at low temperature and high pressure. These compounds are called.
Choose an answer
Halides
Hydrates
Clathrates
All of above
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